EP2510851B1 - Vacuum cleaner with a filter device and a muffler - Google Patents

Description

TECHNICAL AREA

Embodiments of the present invention relate to a device for cleaning or filtering an exhaust air stream by means of an air filter, as z. B. in household appliances, such as in particular, but not exclusively, vacuum cleaners.

STATE OF THE ART

To remove dust from an exhaust stream of a household appliance, such as. B. a vacuum cleaner, various filter arrangements are known. Such exhaust air filter arrangements generally comprise an air or particle filter arranged in a filter housing. Frequently, two or three filter stages are arranged in series in a filter arrangement or assembly in order to increase the amount of dust collected or filtered out by the filter assembly to a maximum.

Known exhaust air filter types include, for example, a foam filter which is arranged directly in the exhaust air flow and which in itself already has a relatively high dust retention capacity. An electrical and / or a HEPA (High Efficiency Particulate Airfilter), which is able to collect very small dust particles, in particular particles smaller than 1 µm, can then be arranged downstream of the foam filter, to retain or filter out the residual dust that escaped the upstream foam filter from the exhaust air flow.

In addition to filtering out the finest dust particles, known filter devices can also improve the odor of the exhaust air from a vacuum cleaner. With, for example, dust picked up when vacuuming, even the smallest organisms, such as. B. bacteria or dust mites get into the dust filter of a vacuum cleaner, especially in the dust filter bag. A massive accumulation of all impurities in the dust filter bag and possibly also in the exhaust air filter accelerates and increases the growth and the multiplication of the mites and bacteria, as well as their Excrement formation, which can disadvantageously increase the moisture content in the filters with the additional formation of a warm, humid atmosphere. Due to the then accelerated decomposition processes, an unpleasant smell can develop, particularly in the dust filter bag, which can pollute the ambient air when vacuuming.

In addition to dust and odor nuisance, there is often considerable noise nuisance when exhaust air is blown out by means of a motor-blower unit through conventional filter arrangements arranged upstream or downstream thereof. a. caused by diffuse air turbulence or turbulent flow conditions in and after conventional filter arrangements. Especially in everyday activities such as vacuuming, it would be desirable to keep such noise levels as low as possible.

The US 5 289 612 A relates to a noise reduction system for an upright vacuum cleaner. The EP 1 649 796 A2 so refers to a suction device. Also the DE 29 17 094 A1 relates to a device for sound insulation in a vacuum cleaner. The EP 1 551 269 B1 relates to noise reduction arrangement for a vacuum cleaner. The US 2010/0 212 104 A1 Finally, relates to a filter chamber construction for a surface cleaning device that works on the cyclone principle.

The JP H05 - 317 208 A. and US 2007/0 113 528 A1 each disclose a filter device for cleaning an exhaust air flow by means of a filter arrangement, in particular in a household appliance, comprising: a housing for receiving the filter arrangement downstream of an exhaust air inlet of the housing, the housing having an exhaust air outlet for the exhaust air flow downstream of the filter arrangement which can be accommodated therein, the Exhaust air outlet is coupled via a plurality of air guide ribs to a relaxation area for the exhaust air flow arranged downstream of the exhaust air outlet, the air guide ribs being arranged parallel to one another in a transition area from the exhaust air outlet to the relaxation area, in order to rectify the air flowing to the relaxation area, and the relaxation area in front an outer outlet with outlet ribs of the vacuum cleaner outer housing is arranged.

PRESENTATION OF THE INVENTION

It is therefore an object of the present invention to reduce noise or noise in an exhaust air discharge area, in particular in household appliances, such as, for. B. vacuum cleaners.

This object is achieved by the vacuum cleaner with a vacuum cleaner outer housing and a filter device according to claim 1, further preferred embodiments are specified in the dependent claims.

One finding of exemplary embodiments of the present invention is to provide a filter arrangement with an air or particle filter, such as a HEPA filter, in a filter housing provided for this purpose, downstream of an engine-blower unit. B. a vacuum cleaner to arrange, and a blown out of the filter arrangement in the downstream direction, filtered exhaust air downstream of the filter arrangement downstream air guide ribs before it is passed through a relaxation chamber downstream downstream of the relaxation space to the outside. According to exemplary embodiments, an exhaust air filter arrangement accommodated in a housing is therefore followed by air guide or air guide ribs and an exhaust air relaxation or expansion area for noise reduction.

For this purpose, exemplary embodiments provide a vacuum cleaner with a vacuum cleaner outer housing and a filter device for cleaning an exhaust air flow by means of a filter arrangement, comprising a housing for receiving the filter arrangement downstream of an exhaust air inlet of the housing. The housing has an exhaust air outlet downstream of the filter arrangement which can be accommodated therein, wherein the exhaust air outlet is coupled via a plurality of air guide ribs to a relaxation area for the exhaust air flow arranged downstream of the exhaust air outlet. A noise in the outlet area of the filter device can advantageously be reduced by the air guide ribs downstream of the filter arrangement in or on the housing and the relaxation space connected to the housing. From a diffuse or turbulent air flow that flows out of the filter arrangement located in the housing, a rectified or laminar and / or by means of the relaxation space, a calibrated (laminar) exhaust air flow can be generated in particular by the downstream air guide ribs. A filter arrangement with an air filter is arranged in the housing of the filter device and has a circumferentially arranged air guide rib on a downstream side of the air filter, which rib is designed to block the exhaust air flow from the air filter to an air-permeable sound absorber arranged downstream in series with the air filter. Ie, air filter, air guide rib and sound absorber together form the filter arrangement. It can serve as an air-permeable sound absorber, for example, a sound-absorbing layer, which, for example, a sound-absorbing fleece or a sound-absorbing foam, such as. B. may have a melamine resin foam. In exemplary embodiments, the sound absorber of the filter arrangement merely takes on a sound-absorbing function and / or rectifies the exhaust air flow. In contrast, particle and / or odor filtration by means of the sound-absorbing layer is not provided. This can already be done by the upstream air filter of the filter arrangement.

According to embodiments, the relaxation area of the housing downstream of the air guide ribs is essentially funnel-shaped, such that it extends in a downstream direction from the exhaust air outlet, i.e. extended from a narrower beginning of the relaxation area to a wider end of the relaxation area. The end of the relaxation area is directed to an outlet for the laminar, relaxed and / or calmed exhaust air from the household appliance in order to discharge the exhaust air to the environment. Due to an essentially funnel-shaped shape of the relaxation area, the exhaust air flow previously rectified by the air guide ribs can particularly advantageously continuously relax and calm down as it flows outward.

In some exemplary embodiments, the air guide ribs are arranged essentially parallel to one another in a transition area from the exhaust air outlet in the housing to the relaxation area, in order to rectify the diffuse exhaust air flowing from the housing to the relaxation area by means of the air guide ribs, i.e. to obtain a flow that is as laminar as possible. In principle, any orientation of the parallel air guiding ribs can be provided.

The housing, the air guide ribs and the relaxation area are preferably formed in one piece. That is, the housing, the air guide ribs and the relaxation area together form a one-piece or one-piece blow-out area for the exhaust air flow filtered by the filter arrangement. The one-piece blow-out area comprising the housing, the air-guiding ribs and the relaxation area can thereby in particular by means of a plastic injection molding process. Due to the one-piece or one-piece design, on the one hand a complicated assembly of the blow-out area can be avoided, and on the other hand an increased noise development due to, for example, loose parts can be avoided. The one-piece construction also means that there is no undesirable turbulent air turbulence caused by incorrectly connected individual parts or resulting gaps.

In such a filter arrangement, the air or particle filter is preferably airtight or leak-free coupled to the air-permeable sound absorber via the air-guiding or air-guiding rib in order to reduce noise. Diffuse blow-out air can thus be guided through the air filter rib without leakage and then calmly flow out of the outlet areas of the air-permeable sound absorber. A filter arrangement constructed in this way can additionally reduce unpleasant and annoying noises in the blow-out area after an engine-blower unit.

Such a filter arrangement, through its arrangement in the housing, can interact particularly synergistically with the filter device presented here to reduce a blow-out noise, since both the filter arrangement and the air guiding ribs located in or on the housing and the relaxation area can each provide for noise reduction.

Embodiments of the present invention also include a household appliance, such as an air conditioning system, but in particular a vacuum cleaner, with a filter device according to embodiments of the present invention.

Further exemplary embodiments and advantageous developments are the subject of the dependent claims and the following detailed description of the accompanying figures.

Exemplary embodiments of the present invention are explained in more detail below with reference to the attached figures. Show it:

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1

a schematic cross section through a filter device for cleaning an exhaust air stream, according to an embodiment of the present invention;

Fig. 2

a perspective view of the filter device according to Fig. 1 ;

Fig. 3

a representation of the filter device according to the Fig. 1 and Fig. 2 in a vacuum cleaner; and

Fig. 4

a vacuum cleaner with a filter device according to an embodiment.

DETAILED DESCRIPTION OF EMBODIMENTS

The Fig. 1 shows a schematic representation of a cross section through a filter device 10 for cleaning or filtering an exhaust air flow, which is indicated by reference numeral 11, by means of a filter arrangement 12.

The filter device 10 has a housing 13 for receiving, downstream of an exhaust air inlet 14 of the housing 13, of the filter arrangement 12, the housing 13 downstream of the filter arrangement 12 which can be accommodated therein having an exhaust air outlet 15 for the exhaust air flow 11, the exhaust air outlet 15 via a A plurality of air guide ribs 16 is coupled to a relaxation area 17 for the exhaust air flow 11 arranged downstream of the exhaust air outlet 15. Here, “downstream” means in the flow direction and “upstream” counter to the flow direction of the exhaust air flow 11.

In exemplary embodiments, a motor-blower unit can be arranged in the housing 13 in an area upstream, or in front of the housing region referred to as exhaust air inlet 14 Fig. 1 but is not shown. This motor-blower unit can convey the still unfiltered exhaust air flow 11 through the area of the exhaust air inlet 14 to the filter arrangement 12, so that the exhaust air flow 11 can be air filtered by the latter.

For this purpose, the filter arrangement 12 can have an air filter 18, which can be, for example, a particle or suspended matter filter in the form of a HEPA filter. HEPA filters can be used, for example, to filter out viruses, respirable dust, mite eggs and excretions, pollen, smoke particles, asbestos, bacteria, and many others toxic dusts, etc., from the exhaust air stream 11 are used. Accordingly, some exemplary embodiments of the filter device 10 can be used, inter alia, in the medical field, for example in operating rooms, intensive care units and / or laboratories, and in clean rooms. The respective purpose is decisive for the selection of a filter class of the air filter 18. Other embodiments of the filter device 10 can also be used for non-industrial applications, such as in household appliances, and in particular in vacuum cleaners. Vacuum cleaners generally also include a motor-blower unit, by means of which a dust-containing exhaust air flow 11 can be filtered via the (downstream) filter arrangement 12 and then blown outwards. In connection with a vacuum cleaner, the air filter 18 can be, for example, a HEPA filter, an electrical dust filter and / or a foam filter for odor absorption. Depending on the intended use, the air filter 18 can also be understood to mean a combination of different air, particle and / or odor filters.

Seen in the direction of the exhaust air flow 11, i.e. downstream, the air filter 18 can be followed by an air-permeable sound absorber 19. According to exemplary embodiments, the sound absorber 19 can primarily serve to calm and / or rectify an exhaust air flow 11, which predominantly diffuses from the air filter 18, so that a blowout noise of the filter device 10 caused by the exhaust air flow 11 or related to it can be reduced. For this purpose, the air-permeable sound absorber 19 can be a sound-absorbing or sound-reducing layer, according to exemplary embodiments. However, this sound-absorbing or reducing layer 19 has no air purification function, but mainly serves to calm down and / or also to rectify the exhaust air flow 11 and thus to reduce noise. According to some exemplary embodiments, the sound-absorbing material can be, for example, a sound-absorbing fleece or a sound-absorbing foam, such as a melamine resin foam.

An encircling air guide rib 20 arranged in the transition region between the air filter 18 and the sound absorber 19 is preferably designed to direct the exhaust air flow 11 from the air filter 18 to the air-permeable sound absorber or to the sound-absorbing layer 19 without leakage. That is, the sound absorbing layer 19 is the Air filter 18 by means of the air guiding rib 20 is quasi airtight or leakage-free for noise reduction, which is to be understood as meaning that no exhaust air should be able to flow between side walls 21 of the sound absorber 19 and the circumferential air guiding rib 20.

For this purpose, the circumferential air guide rib 20 forms a contour pocket in exemplary embodiments, the contour of which is designed to accommodate the air-permeable sound absorber 19 without play, so that no exhaust air can flow between the sound absorber 19 and the circumferential air guide rib 20. The contour or the floor plan of the circumferential air guide rib 20 is thus adapted to a contour or a floor plan of the sound-absorbing layer 19. According to exemplary embodiments, the circumferential air-guiding rib 20 and the sound-absorbing layer 19 can have an essentially rectangular contour, corresponding to a cuboid volume of the sound absorber 19 and / or the air filter 18. Of course, other layouts or contours, such as square or circular contours, are also conceivable with regard to the air filter 18, the circumferential air guide rib 20 and / or the sound-absorbing layer 19.

In order to be able to accommodate the sound absorber 19 without play in the circumferential air guide rib 20, the inner dimensions of the circumferential air guide fin 20 can be, for example, slightly smaller than the outer dimensions of the sound absorber 19. In this way, after the sound absorber 19 has been introduced into the contour of the circumferential air guide fin 20, or the frame formed by this, take a kind of clamp fit in the circumferential air guide rib 20. In particular in connection with an elastic, sound-absorbing foam 19, freedom from play or leakage can thus be achieved. In addition or as an alternative to the press fit, the air-permeable sound absorber 19 can also be glued on its side surfaces 21 to inner surfaces of the circumferential air guide rib 20 in order to prevent exhaust air from flowing between the side walls of the sound absorber 19 and the air guide rib 20.

In a preferred exemplary embodiment, the circumferential air-guiding rib 20 has a lower height than the air-permeable sound absorber 19 to be accommodated therein, so that the side surfaces 21 of the air-permeable sound absorber 19 are only partially covered by the circumferential air-guiding rib 19 when the filter arrangement 12 is in the assembled state be like it is in the Fig. 1 is also recognizable. That is, the sound-absorbing, air-permeable layer 19 stands in the assembled state beyond a frame formed by the air guide rib 20 for the sound absorber 19, as a result of which the side surfaces 21 of the sound absorber 19 can be used as a blow-out surface in addition to a downstream exhaust air outlet surface of the sound absorber 19. This can advantageously contribute to a further reduction in a resistance formed by the sound absorber 19 and thus to a reduction in the air speed and the blowing noise.

According to one exemplary embodiment of the present invention, the sound-absorbing or reducing layer 19 can, for example (in Fig. 1 seen in the downstream direction) have a height of approx. 20 mm. This means that, according to one embodiment, the height of the circumferential air guide rib 16 is less than 20 mm. The height of the circumferential air-guiding rib 19 is preferably less than half the height of the sound absorber 19 in order to provide sufficient lateral exhaust air discharge surface on the sound absorber 19. In one embodiment of the filter arrangement 12, the filter arrangement 10 can have, for example, a length I of approximately 160 mm, a width b of approximately 60 mm and a height h of approximately 45 mm. With a height of the sound-absorbing foam 19 of approximately 20 mm, this results in a possible height of the HEPA filter 18 of approximately 25 mm.

Seen downstream, i.e. in the direction of the exhaust air flow 11, the exhaust air flow 11 in the housing 13 can flow from the exhaust air flow exit surfaces of the filter arrangement 12 to the area of the exhaust air outlet 15. According to the filter arrangement 12, this will initially primarily be a turbulent flow. In order to direct the exhaust air flow 11 also at edge or corner regions 22 of the housing 13 to the downstream exhaust air outlet 15 without serious air turbulence, the end or corner regions 22 of the housing 13 facing the exhaust air outlet 15 can be rounded. As a result, the exhaust air flow 11 can be guided uniformly along inner surfaces of the housing 13 and around the corner regions 22 to the region of the exhaust air outlet 15.

The initially relatively turbulent exhaust air flow 11 becomes from the area of the exhaust air outlet 15 via the air guide or air guide ribs 16 to that connected to the housing Relaxation area 17 directed and, whereby the initially turbulent flow is rectified, ie is converted into a predominantly laminar flow. For this purpose, the air guide ribs 16 are arranged or aligned parallel to one another in a transition region from the exhaust air outlet 15 to the relaxation or expansion region 17. When using Fig. 1 In the illustrated embodiment, the parallel air guiding ribs 16 are each aligned in the horizontal direction in the transition region. However, vertical or oblique orientations are also conceivable - depending on the embodiment of the downstream relaxation room or area 17. Although in Fig. 1 Five parallel air guide ribs 16 are shown by way of example, exemplary embodiments can also have more or less than five air guide ribs 16. For example, their number can range from three to ten.

In preferred exemplary embodiments of the filter device 10, the housing 13, the air guide ribs 16 and the expansion or relaxation area 17 are formed in one piece, so that a coherent, one-piece blow-out area 13, 15, 16, 17 is formed for the exhaust air flow 11. In this way, a targeted (laminar) exhaust air flow 11 with little air turbulence can also be achieved in the absence of an external cover of the filter device 10, such as a vacuum cleaner outer housing. The filter arrangement 12 located therein can be protected from damage by the preferably one-piece housing 13. To produce the one-piece blow-out area 13, 15, 16, 17 comprising the housing 13, the exhaust air outlet 15, the air guide ribs 16 and the area 17, for example, an injection molding process can be used to obtain a one-piece plastic part as the blow-out area 13, 15, 16, 17 .

Like it in particular Fig. 2 , which shows the filter device 10 in a perspective view, the relaxation area 17 can be substantially funnel-shaped, so that it extends in a downstream direction from the area of the exhaust air outlet 15, which forms an initial area of the relaxation area 17 End area of the relaxation area 17 expanded. The already rectified exhaust air flow 11 coming from the area of the exhaust air outlet 15 and the air guide ribs 16 can advantageously relax or calm down in the funnel-shaped expansion area 17 which is preferably integrally formed on the housing 13. One to one in Fig. 2 Cyclone separator (not shown) facing the outer wall 23 of the expansion region 17 can be at least partially, as a rotationally symmetrical Container-designed cyclone separator adapted, run in a circular arc. As it is particularly from the sectional view of the Fig. 1 becomes clear, downstream end portions of the side walls of the relaxation area 17, similar to a trapezoid, can be chamfered and adapted to an outer housing or vacuum cleaner cover, as is with reference to FIG Fig. 4 will be made clear.

Like it in Fig. 2 is indicated, projections 24 which protrude laterally and are also formed on a filter frame of the filter arrangement 12 and which serve as gripping sections, by means of which the filter arrangement 12 can be more easily introduced into or removed from the housing 13.

The Fig. 3 shows the filter device 10 in a state installed in a household appliance, wherein the household appliance can be a vacuum cleaner according to an embodiment.

The vacuum cleaner 30 has a motor-blower unit 31 in order to separate small particles from dust-laden air for the purpose of cleaning the air in a cyclone separator (not shown) and to separate them in a collecting container. Cyclone separators and collecting containers can be accommodated in an area provided with the reference number 32. Such a cyclone separator, designed as a rotationally symmetrical container, is eccentrically supplied with dust-laden, sucked-in air in an upper part from a fan (motor-blower unit 31), so that heavier dust particles are exposed to a wall of the wall under the effect of centrifugal forces Be guided container and can be removed from coarse dust air (exhaust air) through an immersion tube centrally inserted in the upper part of the container (in the direction of filter assembly 12). The dust particles are inhibited in their circular movement by friction on the container wall and, slowly falling, they enter a collecting container located under the cyclone, from which they can be removed. The motor-blower unit 31 can also be accommodated in the housing 13 upstream of the filter arrangement 12. From the motor-blower unit 31, the exhaust air is passed via the filter arrangement 12 in the housing 13 to the relaxation area 17 of the filter device 10 before it is passed through a Fig. 4 shown vacuum cleaner outer housing outlet 41 Vacuum cleaner outer housing 42 is released to the environment. An alignment of the parallel air guiding ribs 16 of the housing 13 can advantageously be adapted to an alignment of outlet ribs of the outer outlet 41 in order to flow against it with as little noise as possible. An additional (sound-absorbing) seal in the form of a black fleece can be provided, for example, between the downstream end sections of the relaxation region 17 and the vacuum cleaner outer housing outlet 41 of the vacuum cleaner outer housing 42.

Exemplary embodiments of the present invention thus also include a vacuum cleaner 30 with a filter device 10 according to exemplary embodiments.

In exemplary embodiments, an exhaust air filter 18, which may include a HEPA filter, for example, has a circumferential air guide rib 20 downstream. This rib 20 can be integrally formed on the outflow side of the filter 18. A sound-absorbing foam can in turn be clamped in an airtight manner as sound absorber 19 in the contour pocket thus formed. By means of exemplary embodiments of the present invention, diffuse blow-out air can be guided past the air-guiding rib 20 without leakage and thus flow out calmly at the outlet areas of the foam-like sound absorber 19. In particular, through exemplary embodiments in which the downstream sound absorber 19 projects beyond the circumferential air guide rib 20, the side surfaces 21 of the foam-like sound absorber 19 can additionally be used as a blow-out surface, which can contribute to a further reduction in the air speed and the blow-out noise.

In accordance with the housing concept described here, air guide ribs 16 are arranged downstream of the filter arrangement 12 for noise reduction, these ribs 16 being fixedly or captively connected to the housing 13. Even in the absence of an outer housing cover 41, a targeted air flow 11 with little air turbulence can thus be achieved. Furthermore, the filter arrangement 12 located in the housing 13 can be protected against damage.

The relaxation or expansion space 17 between the filter arrangement 12 and an outer housing cover 41 can advantageously reduce a blow-out noise. An escaping warm blow-out air 11 can heat adjacent housing components, which can be held securely in position by the air guide ribs 16 and / or the one-piece housing construction even in the case of prolonged continuous operation and thus deformations caused by heating can be reduced or avoided. This ensures a tight exhaust system.

REFERENCE SIGN LIST

10th

Filter device

11

Exhaust air flow

12

Filter arrangement

13

casing

14

Exhaust air inlet

15

Exhaust air outlet

16

Air guiding ribs

17th

Relaxation or expansion area

18th

Air filter

19th

Sound absorber

20th

all-round air guide rib

21st

Side surface of the sound absorber

22

Housing corner area

23

curved side wall of the relaxation or expansion area

24th

Handle, tab

30th

vacuum cleaner

31

Motor-blower unit

32

Space for cyclone separators

41

Vacuum cleaner outer housing outlet

42

Vacuum cleaner outer casing

Claims (8)

1. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) for cleaning an exhaust air flow (11) by means of a filter arrangement (12), comprising:
   a housing (13) for receiving the filter arrangement (12) downstream of an exhaust air inlet (14) of the housing (13), wherein the housing (13) downstream of the filter arrangement (12) which can be received therein has an exhaust air outlet (15) for the exhaust air flow (11), wherein the exhaust air outlet (15) is coupled via a plurality of air guide ribs (16) to a detensioning area (17) for the exhaust air flow (11) arranged downstream of the exhaust air outlet (15), wherein the air guide ribs (16) are arranged parallel to each other in a transition area from the exhaust air outlet (15) to the detensioning area (17) in order to rectify the air flowing to the detensioning area (17), and wherein the detensioning area (17) is arranged in front of an outer outlet (41) with outlet ribs of the vacuum cleaner outer housing (42), characterised in that the filter arrangement (12) has an air guide rib (20) which is circumferentially arranged on a downstream side of an air filter (18) and is designed to guide the exhaust air flow (11) from the air filter (18) to an air-permeable sound absorber (19) arranged downstream in series to the air filter (18).
2. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) according to claim 1, wherein the detensioning area (17) is substantially funnelshaped, such that it widens in a downstream direction from the exhaust air outlet (15) to an end region of the detensioning area (17).
3. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) according to claim 1 or 2, wherein the housing (13), the exhaust air outlet (15), the air guide ribs (16) and the detensioning area (17) are integrally formed.
4. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) according to one of the preceding claims, wherein the circumferential air guide rib (20) is designed to guide the exhaust air flow (11) from the air filter (18) to the air-permeable sound absorber (19) without leakage.
5. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) according to one of the preceding claims, wherein the circumferential air guide rib (20) has a lower height than the air-permeable sound absorber (19) to be accommodated therein, such that lateral surfaces (21) of the air-permeable sound absorber (19) in the assembled state of the filter arrangement (12) are only partially covered by the circumferential air guide rib (20).
6. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) according to one of the preceding claims, wherein the air filter (18) has a particle filter, in particular a HEPA filter, and/or the sound absorber (19) has a sound-absorbing foam.
7. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) according to one of the preceding claims, wherein an orientation of the air guide ribs (16) is aligned with an orientation of the outlet ribs of the outer outlet (41) in order to flow quietly to the outer outlet (41).
8. Vacuum cleaner (30) having a vacuum cleaner outer housing (42) and a filter device (10) for cleaning an exhaust air flow (11) according to one of the preceding claims, wherein the filter device (10) is arranged downstream of a motor-blower unit (31).

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